sp-dev-fx-webparts/samples/js-extend-webpack/config/config.json

{
  "$schema": "https://dev.office.com/json-schemas/spfx-build/config.2.0.schema.json",
  "version": "2.0",
  "bundles": {
    "webpack-example-bundle": {
      "components": [
        {
          "entrypoint": "./lib/webparts/webpackExample/WebpackExampleWebPart.js",
          "manifest": "./src/webparts/webpackExample/WebpackExampleWebPart.manifest.json"
        }
      ]
    }
  },
  "localizedResources": {
    "webpackExampleStrings": "lib/webparts/webpackExample/loc/{locale}.js"
  },
  "externals": {}
}